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Stock Based Compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 9 Months Ended | 3 Months Ended |  | 1 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended |
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Jun. 30, 2012 | Dec. 31, 2011 Performance Based RSUs [Member] | Dec. 31, 2011 Time Based Restricted Stock Unit [Member] | Oct. 31, 2010 Additional Restricted Stock Units [Member] | Oct. 31, 2010 Restricted Stock Units (RSUs) [Member] Vote | Jun. 30, 2012 Restricted Stock Units (RSUs) [Member] | Jun. 30, 2011 Restricted Stock Units (RSUs) [Member] | Sep. 30, 2011 Restricted Stock Units (RSUs) [Member] Chief Executive Officer [Member] | Dec. 31, 2011 Restricted Stock Units (RSUs) [Member] Time Based RSUs [Member] | Oct. 31, 2010 Restricted Stock Units (RSUs) [Member] Maximum [Member] | Oct. 31, 2010 Restricted Stock Units (RSUs) [Member] Minimum [Member] | Dec. 31, 2010 Restricted Stock Grants [Member] | Jun. 30, 2012 Restricted Stock Grants [Member] | Jun. 30, 2011 Restricted Stock Grants [Member] | Dec. 31, 2010 Restricted Stock Grants [Member] Maximum [Member] 2006 Plan [Member] | Dec. 31, 2010 Restricted Stock Grants [Member] Minimum [Member] 2006 Plan [Member]
Stock Based Compensation (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units (RSUs), Granted |  | 32,894 |  | 4,482 | 34,566 |  |  |  | 21,931 |  |  |  |  |  |  |
Restricted stock immediately vested |  |  |  |  |  |  |  | 7,601 |  |  |  |  |  |  |  |
Restricted stock units fair value per unit |  | 31.18 | 31.18 | 32.12 | 30.79 |  |  |  |  |  |  |  |  |  |  |
RSUs vest period |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Actual amount of RSUs earned based on cumulative earnings |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |
Performance cycle |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Target RSUs granted range |  |  |  |  |  |  |  |  |  | 150.00% | 0.00% |  |  |  |  |
Remaining Time based RSUs |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |
RSUs Voting Right of common stock |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Compensation expense related to restricted stock |  |  |  |  |  | $ 0.7 | $ 0.1 |  |  |  |  |  |  |  |  |
Restricted Stock Issuable To Eligible Board of Directors Members Annually |  |  |  |  |  | 2,000 |  |  |  |  |  |  |  |  |  |
Restricted stock issued |  |  |  |  |  |  |  |  |  |  |  |  | 16,000 | 16,000 |  |
Restricted stock issued, par value |  |  |  |  |  |  |  |  |  |  |  |  | $ 37.50 | $ 33.49 |  |
Restricted Stock Grants Vest Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Restricted stock grants vest period |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |
Restricted stock issued to officers and certain employees, range |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32.12 | $ 30.79
Restricted stock grants vest over grant period |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Compensation expense recognized on grant date |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Compensation expense related to restricted stock grants |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.4 | $ 0.8 |  |
Share Based Compensation Arrangement By Share Based Payment Issued As Restricted Stock Unit |  |  |  |  |  |  |  |  |  |  |  | 26,000 |  |  |  |

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